# -*- coding: utf-8 -*-
#--------------------------------------------------------------------------
# Copyright (c) 2009 Barry Schwartz
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use,
# copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following
# conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#--------------------------------------------------------------------------

import kt

#--------------------------------------------------------------------------

class PDFMatrixError(Exception):
    def __init__(self, value):
        self.value = value
    def __str__(self):
        return repr(self.value)

def matrix(m):
    if isinstance(m, collections.Sequence):
        if len(m) == 4:
            result = tuple(m) + (0, 0)
        elif len(m) == 6:
            result = tuple(m)
        else:
            raise PDFMatrixError('Expected 4 or 6 values, but got ' + len(m))
    else:
        result = (m, 0, 0, m, 0, 0)
    return result

#--------------------------------------------------------------------------

def save_graphics_state():
    return 'q'

def restore_graphics_state():
    return 'Q'

def concat_matrix(m):
    (a, b, c, d, e, f) = matrix(m)
    return '{0} {1} {2} {3} {4} {5} cm'.format(a, b, c, d, e, f)

#--------------------------------------------------------------------------

